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E. A. GILLINDER. PROCESS 0F MANUFACTURING DOUBLE SURFAGE GLASSREFLBCTORS.

N0. 425,939. Patented Apr. 15, 1890.

MGA?.

UNITED STATES PATENT OFFICE.

EDGAR A. GILLINDER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TOGI-LLINDER dt SONS.`

PROCESS F MANUFACTURING DOUBLE-SURFACE GLASS REFLECTORS.

SPECIFICATION forming part of Letters Patent NO. 425,939, dated April15, 1890.

Application filed November 14, 1889. Serial No. 330,276. (No model.)

T0 all whom it may concern.-

Be it known that I, EDGAR A. GILLINDER, a citizen of the United States,and a resident of the city and county of Philadelphia, State ofPennsylvania, have invented a new and useful Process for ManufacturingDouble-Surface Glass Reilectors provided with an orifice through each ofsaid surfaces, of which the following is a true and exact description,due reference being had to the drawings which accompany and form part ofthis application, and in which similar letters denote similar parts.v

Figure 1 illustrates in section the ordinary glass double reflector,which consists, essentially, of the surfaces A and B, between whichsurfaces is placed mercury, so as to form a reflecting-surface. Thegreat advantage of these reflectors is that the mercury is protected andabrasion prevented. The only other method in use to accomplish the sameresult is by a singlel surface set with Wood or other backing to protectthe mercury. As shown in Fig. l, the surface B is a continuous surface,preventing the use of the reflector where the chimney of a lamp mustpass through it or the support for an electric-light lamp project downthrough it.

In Fig. l is illustrated in section a reflector made in accordance withmy improved process. As may be seen, both surfaces A and B in thisreflectorare broken, so that while the mercury is protected between thesurfaces A and B, still the reflector is one that can be used where thechimney of the lamp must pass through the reflector.

Y My process is as follows: The reflector is blown or molded in theordinaryway into the form shown in Fig. l. A lump of molten glass C isthen placed in the surface B of said reflector, as shown in Fig. 2. InFig. 2 the molten glass in full lines is shown in the top of saidreflector. In place of dropping on the upper surface of the surface B itmay be placed on the lower surface of said surface B. In either case, asindicated by dotted lines, Fig. 2, it is placed at the point where theorifice is desired tobe made in the surface B. The portion D of saidsurface B, upon which the molten glass C is placed, is then pressed out,either by a block forcing it out or turning the reflector upside down,and allowing` it to pass out by its own weight. The reflector thenassumes the position shown in Fig. 3, forming the projecting surface E.The portion of the surface E above the projecting portions a ct of thesurface A is cut olf by a hot rod as cylinder glass is cut or separated,as shown in dotted lines, Fig. 3, and the reflector is then in the formshown in Fig. 4.

By my improved process I am enabled to manufacture cheaply and withcertainty glass reflectors having double surfaces and an oriflce throughboth surfaces. The mercury is added between the surfaces A and B of Fig.4 after the construction of the reflector is completed.

Having now fully described my invention, what I claim, and desire toprotect by Letters Patent, is-

l. The hereinbefore-described process of forming glass reflectors havingdouble surfaces, between which surfaces the mercuryis placed, and anorifice through both of said surfaces, which consists in molding orblowing the glass into the shape of a reflector having double surfaces,the lower surface being continuous, then placing molten glass upon thelower surface of said reflector at or near the point where the orificeis to be produced, then forcing out the surface upon which the moltenglass has been placed, and then cutting o the top portion of said projecting surface.

2. The hereinbefore-described process of forming glass reflectors havingdouble surfaces, between which surfaces the mercury is placed, and anorifice through both of said surfaces, which consists in molding orblowing the glass into the shape of a reflector having double surfaces,the lower surface being continuous, then placing molten glass upon thelower surface of said reflector at or near the point Where the orificeis to be produced, then forcing out the surface upon which the moltenglass has been placed, and then cutting off the top portion of saidprojecting surface at the 'point where it is in line with the uppersurface of said reflector.

3. An improved process for forming an oriflee in the lower surface of adouble-surfaced glass reflectoigwhich consists inplacing molten glassupon said lower surface at or near the IOO point Where the orifice isdesired, then forcing ont said surface upon which the molten glass isplaced, and then removing the top portion of said proj ectng surface.

5 4. An improved process for forming an orice in the lower surface of adouble-surfaced glass reilector,which consists in placing molten glassupon said lower surface ator near the A point Where the orifice isdesired, then forcro ing out said surface upon Which the molten glass isplaced, and then removing that portion of said projecting surface whichextends beyond the upper surface of said reiector.

In Witness whereof I have signed my name this 6th day of November, 1889.

EDGAR A. GILLINDER. Witnesses:

ABNER J. DAVIS, FRANK S. BUssnR.

